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Stock-Based Compensation (Summary of All Stock Option Activity) (Details)
$ / shares in Units, $ in Thousands
 6 Months Ended
Jun. 30, 2017
USD ($)
$ / shares
shares
Shares  
Options outstanding at beginning of period (in shares) | shares 24,999,665
Granted (in shares) | shares 674,110
Exercised (in shares) | shares (3,242,026)
Forfeited (in shares) | shares (161,836)
Options outstanding at end of period (in shares) | shares 22,269,913
Exercisable at end of period (in shares) | shares 16,181,093
Weighted Average Exercise Price  
Options outstanding at beginning of period (in dollars per share) | $ / shares $ 4.91
Granted (in dollars per share) | $ / shares 20.57
Exercised (in dollars per share) | $ / shares 4.04
Forfeited (in dollars per share) | $ / shares 7.27
Options outstanding at end of period (in dollars per share) | $ / shares 5.50
Exercisable at end of period (in dollars per share) | $ / shares $ 4.13
Options outstanding at end of period, Weighted Average Remaining Contractual Term 4 years 3 months
Exercisable at end of period, Weighted Average Remaining Contractual Term 3 years 8 months 19 days
Options outstanding at end of period, Aggregate Intrinsic Value, in dollars | $ $ 426,081
Exercisable at end of period, Aggregate Intrinsic Value, in dollars | $ $ 331,770